"""后台会员管理：全局 Huiyuan 定义 + 各俱乐部 ClubHuiyuanPrice 售价/分成。"""
import random
import string
from decimal import Decimal

from django.db import transaction

from jituan.constants import CLUB_ID_DEFAULT, DATA_SCOPE_ALL
from jituan.models import ClubHuiyuanPrice
from jituan.services.club_context import club_id_for_write, resolve_club_id_from_request, resolve_club_scope
from jituan.services.club_user_access import list_response_meta
from products.models import Huiyuan


def _format_member(m, price_row=None):
    global_jiage = str(m.jiage)
    global_guanshifc = str(m.guanshifc)
    global_zuzhangfc = str(m.zuzhangfc)
    item = {
        'huiyuan_id': m.huiyuan_id,
        'jieshao': m.jieshao,
        'jtjieshao': m.jtjieshao,
        'jiage': global_jiage,
        'guanshifc': global_guanshifc,
        'zuzhangfc': global_zuzhangfc,
        'global_jiage': global_jiage,
        'global_guanshifc': global_guanshifc,
        'global_zuzhangfc': global_zuzhangfc,
        'goumai_cishu': m.goumai_cishu,
        'CreateTime': m.CreateTime.isoformat() if m.CreateTime else None,
        'UpdateTime': m.UpdateTime.isoformat() if m.UpdateTime else None,
        'bankuai_id': m.bankuai_id,
        'club_enabled': True,
        'price_source': 'global',
    }
    if price_row is not None:
        item['jiage'] = str(price_row.jiage)
        item['guanshifc'] = str(price_row.guanshifc)
        item['zuzhangfc'] = str(price_row.zuzhangfc)
        item['club_enabled'] = bool(price_row.is_enabled)
        item['price_source'] = 'club'
    return item


def build_member_list_payload(request):
    scope = resolve_club_scope(request)
    club_id = resolve_club_id_from_request(request)
    members = Huiyuan.query.all().order_by('-CreateTime')
    member_list = []

    price_map = {}
    if scope != DATA_SCOPE_ALL:
        price_map = {
            r.huiyuan_id: r
            for r in ClubHuiyuanPrice.query.filter(club_id=club_id)
        }

    if scope == DATA_SCOPE_ALL:
        for m in members:
            member_list.append(_format_member(m))
    else:
        for m in members:
            row = price_map.get(m.huiyuan_id)
            if row is None and club_id != CLUB_ID_DEFAULT:
                continue
            if row is not None and not row.is_enabled:
                continue
            member_list.append(_format_member(m, row))

    return {
        'list': member_list,
        'club_id': club_id,
        'scope': scope,
        'price_note': (
            f'当前俱乐部 {club_id} 专属售价（表 club_huiyuan_price）。'
            '若与星阙相同，是创建时从 xq 复制的默认值，请在本俱乐部视图下修改价格。'
            if scope != DATA_SCOPE_ALL else
            '集团汇总：展示全局默认价。请切换到具体俱乐部查看/编辑专属价。'
        ),
        **list_response_meta(request),
    }


def update_member_for_club(request, huiyuan_id, jieshao, jiage, guanshifc, zuzhangfc, jtjieshao):
    if resolve_club_scope(request) == DATA_SCOPE_ALL:
        return None, '集团汇总视图下不可修改，请切换到具体俱乐部'

    club_id = club_id_for_write(request)

    with transaction.atomic():
        try:
            member = Huiyuan.objects.select_for_update().get(huiyuan_id=huiyuan_id)
        except Huiyuan.DoesNotExist:
            return None, '会员不存在'

        member.jieshao = jieshao
        member.jtjieshao = jtjieshao
        member.save(update_fields=['jieshao', 'jtjieshao', 'UpdateTime'])

        row, created = ClubHuiyuanPrice.query.get_or_create(
            club_id=club_id,
            huiyuan_id=huiyuan_id,
            defaults={
                'jiage': jiage,
                'guanshifc': guanshifc,
                'zuzhangfc': zuzhangfc,
                'is_enabled': True,
                'bankuai_id': member.bankuai_id,
            },
        )
        if not created:
            row.jiage = jiage
            row.guanshifc = guanshifc
            row.zuzhangfc = zuzhangfc
            row.is_enabled = True
            row.save()

        if club_id == CLUB_ID_DEFAULT:
            member.jiage = jiage
            member.guanshifc = guanshifc
            member.zuzhangfc = zuzhangfc
            member.save(update_fields=['jiage', 'guanshifc', 'zuzhangfc', 'UpdateTime'])

    return {'huiyuan_id': huiyuan_id}, None


def add_member_for_club(request, jieshao, jiage, guanshifc, zuzhangfc, jtjieshao, bankuai_id=None):
    if resolve_club_scope(request) == DATA_SCOPE_ALL:
        return None, '集团汇总视图下不可添加，请切换到具体俱乐部'

    club_id = club_id_for_write(request)

    def generate_huiyuan_id():
        while True:
            new_id = ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))
            if not Huiyuan.query.filter(huiyuan_id=new_id).exists():
                return new_id

    with transaction.atomic():
        new_id = generate_huiyuan_id()
        member = Huiyuan.query.create(
            huiyuan_id=new_id,
            jieshao=jieshao,
            jiage=jiage,
            guanshifc=guanshifc,
            zuzhangfc=zuzhangfc,
            jtjieshao=jtjieshao,
            goumai_cishu=0,
            bankuai_id=bankuai_id,
        )
        ClubHuiyuanPrice.query.create(
            club_id=club_id,
            huiyuan_id=new_id,
            jiage=jiage,
            guanshifc=guanshifc,
            zuzhangfc=zuzhangfc,
            is_enabled=True,
            bankuai_id=bankuai_id,
        )

    return {'huiyuan_id': member.huiyuan_id}, None